Oh man, tell me about it. I went through it back in 2016 and it was a nightmare.
It has such an insanely long half-life, it takes 48 hours before the effects even wear off. I can only imagine how long the metabolites remain in your system for.
I was finally able to taper off very slowly, from 400mg every other day down to about 20mg, before finally taking the plunge and quitting altogether. It took me months though, and I "cheated" a few times with things like moderate doses of Percocet.
It's the best decision I ever made though, because high doses are extremely cardiotoxic. You don't even OD on it in the conventional sense; your heart rhythm just goes haywire and you die instantly.
Hope you're feeling better,
Dreamflyer